Judging from its title I expect the book to examine the variation 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 (Dia) which is what I call the Kan variation.

This expectation is even more reasonable because Everyman offers another older book, called 'Sicilian Kan' by Emms which I used to own and which treated this very line.
Yet I am not entirely certain as the publishers offer no moves and there is some confusion between the Sicilian lines Paulsen, Kan and Taimanov. I know for a fact that quite a few players and authors would call this 4...a6 line the Paulsen variation. And that indeed makes sense as Wilfried (not Louis as far as I know) Paulsen played the line a long time before Ilia Kan and with quite modern ideas. His stronger brother Louis probably contributed to the development of the line but himself preferred 4...Nf6 (generally followed by a quick ...Nc6) and 4...Bc5 (now known as the Basman-Sale variation).
This doesn't really explain why the 4...Nc6 variation (Dia) quite confusingly is occasionally called the Paulsen variation. The explanation may be that Louis Paulsen reached an important position from that variation repeatedly via the 3.Nc3 Nc6 4.d4 cxd4 5.Nxd4 move-order. Can it be that he after 2...e6 3.d4 cxd4 4.Nxd4 Nc6 feared 5.Nb5!?

So, what about the Taimanov variation then? Well, first of all it's worth noting that Taimanov early in his career played a lot of 4...a6 games. Then, around 1971 he started playing 4...Nc6 - usually followed by ...Nge7, ...Nxd4 and ...Nc6. This system - which now is rather rare - was what Taimanov himself called the Taimanov variation. What I don't really know is why the entire 4...Nc6 system is more and more frequently called the Taimanov system. It's a quite confusing situation and occasionally forces writers to distinguish between the Taimanov variation (where Black usually plays an early ...Qc7) and the 'pure Taimanov' (with ...Nge7).
Still not confused? Then take into account the hybrid variation below, which can equally well arise from 4...a6 5.Nc3 Nc6 and 4...Nc6 5.Nc3 a6 (Dia).

Is it a Kan, a Paulsen or a Taimanov? Well...I find 8129 games in MegaBase 2008, 1159 from the 4...a6 move-order and 6540 from the 4...Nc6 move-order (and obviously some from other move-orders too) ...so maybe it's a Taimanov.
Anyway, the move that interests me the most is 4...a6. That is also clearly the move that Hellsten has played the most, so I expect to buy the book as soon as it's available.

So, what about the Taimanov variation then? Well, first of all it's worth noting that Taimanov early in his career played a lot of 4...a6 games. Then, around 1971 he started playing 4...Nc6 - usually followed by ...Nge7, ...Nxd4 and ...Nc6. This system - which now is rather rare - was what Taimanov himself called the Taimanov variation. What I don't really know is why the entire 4...Nc6 system is more and more frequently called the Taimanov system. It's a quite confusing situation and occasionally forces writers to distinguish between the Taimanov variation (where Black usually plays an early ...Qc7) and the 'pure Taimanov' (with ...Nge7).
Still not confused? Then take into account the hybrid variation below, which can equally well arise from 4...a6 5.Nc3 Nc6 and 4...Nc6 5.Nc3 a6 (Dia).

Is it a Kan, a Paulsen or a Taimanov? Well...I find 8129 games in MegaBase 2008, 1159 from the 4...a6 move-order and 6540 from the 4...Nc6 move-order (and obviously some from other move-orders too) ...so maybe it's a Taimanov.
Anyway, the move that interests me the most is 4...a6. That is also clearly the move that Hellsten has played the most, so I expect to buy the book as soon as it's available.